2020/25

y2020/p25.py

+import itertools
+import sys
+
+
+text = sys.stdin.read()
+A, B = map(int, text.splitlines())
+
+val = 1
+subj = 7
+for i in itertools.count():
+    val = (val * subj) % 20201227
+    if val == A:
+        loopA = i + 1
+        break
+
+val = 1
+subj = B
+for _ in range(loopA):
+    val = (val * subj) % 20201227
+print(val)